TOPSHOT - A cardboard cut-out of China's President Xi Jinping (C) holding a yellow umbrella, a symbol of the 2014 'Umbrella Movement', is carried during a protest march in Hong Kong on July 1, 2017, coinciding with the 20th anniversary of the city's handover from British to Chinese rule. - China's President Xi Jinping warned July 1 that any challenge to Beijing's control over Hong Kong crossed a "red line", as thousands calling for more democracy marched through the city 20 years since it was handed back by Britain. (Photo by Anthony WALLACE / AFP)        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)